Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock options exercised intrinsic value	$ 343	$ 0	$ 10,278
Unrecognized compensation cost related to unvested option	$ 3,612
Weighted average period of recognition	4 years
Weighted average fair value of option granted	$ 6.75	$ 11.87	$ 43.21
Two Thousand And Eleven Plan [Member]
Common stock shares authorized for issuance	6,100,000
Common stock available for future grant	1,100,000
Two Thousand And Eleven Plan [Member] \| Maximum [Member]
Share based compensation stock options expiration period	10 years
Non Employee Director [Member]
Deferred stock units outstanding	131,506	95,553
Non Employee Director [Member] \| Maximum [Member]
Deferred percentage of director fees invested in deferred stock units	100.00%
Restricted Shares [Member]
Weighted average period of recognition	2 years 4 months 24 days
Fair value of restricted stock awards released	$ 1,617	$ 941	$ 4,371
Unrecognized compensation cost related to unvested restricted stock awards	$ 4,697

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- Definition

Deferred Stock Units Outstanding

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- Definition

Share Based Compensation Stock Options Expiration Period.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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